US3964996A - Classifying unit for fibrous suspensions - Google Patents

Classifying unit for fibrous suspensions Download PDF

Info

Publication number
US3964996A
US3964996A US05/554,150 US55415075A US3964996A US 3964996 A US3964996 A US 3964996A US 55415075 A US55415075 A US 55415075A US 3964996 A US3964996 A US 3964996A
Authority
US
United States
Prior art keywords
rotor
suspension
screen cage
outlet
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/554,150
Other languages
English (en)
Inventor
Emil Holz
Reinhold Kapernick
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Finckh Hermann Metalltuch und Maschinenfabrik
Original Assignee
Finckh Hermann Metalltuch und Maschinenfabrik
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19742413310 external-priority patent/DE2413310C3/de
Application filed by Finckh Hermann Metalltuch und Maschinenfabrik filed Critical Finckh Hermann Metalltuch und Maschinenfabrik
Application granted granted Critical
Publication of US3964996A publication Critical patent/US3964996A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges
    • B04B5/12—Centrifuges in which rotors other than bowls generate centrifugal effects in stationary containers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils

Definitions

  • the present invention relates to a classifying unit for fibrous suspension, comprising a pressure screen arranged in combination with a vortex cleaner, wherein there is provided in the upper portion of a chamber a vertically disposed stationary screen cage and a rotor of the pressure screen, said rotor being arranged for rotation inside the screen cage, the lower portion of the casing forming a vortex cleaner, the bottom portion of the vortex cleaner being provided with a heavy material outlet and the upper portion of said vortex cleaner being provided with an accepted stock outlet which is arranged to communicate with the inside of the screen cage, said unit further comprising an inlet for the suspension to be classified, the inlet being arranged in proximity to the lower end of the rotor, said unit further comprising an outlet for the separated fraction of the suspension, said outlet being arranged above the screen cage.
  • An apparatus of this type is known from DT-AS (West German patent application published for inspection) No. 1,461,090. It comprises a connection pipe which is arranged to extend downwardly into the vortex cleaner and is fixedly secured to a mounting flange disposed between the upper and the lower portion of the casing, the connection pipe thus forming an outlet for accepted stock of the vortex cleaner.
  • this connection pipe i.e. somewhat beneath the screen cage and the rotor of the pressure screen, communicates an inlet connecting pipe for feeding the suspension to be classified into the vortex cleaner, the latter connecting pipe being disposed substantially tangentially and being slightly inclined to slope downwardly so that the incoming suspension to be classified in the vortex cleaner generates flow conditions having the form of a downwardly directed helix.
  • the rotor consists of a plurality of stirring foils which are fixedly secured to a central shaft and which are inclined with respect to the axis of the rotor in such a way as to force the suspension to flow upwardly.
  • the particles of the suspension which cannot pass through the perforations of the screen cage are removed through an outlet disposed above the screen cage, which outlet is tangentially arranged with respect to the casing and is provided with closure means of the type of a slide valve.
  • the known devices of the above type are mainly applied in classifying of unsorted mixture of paper stock. It has been found that the known devices can be improved in various respects.
  • the vortex cleaner When operating with stock which has a comparatively high density of the suspension, i.e. with high consistency suspensions, the vortex cleaner does not operate in satisfactory manner as the circulation velocity of the suspension is too low despite the tangential arrangement of the inlet connection pipe communicating with the vortex cleaner. This has as a consequence an accumulation of solid particles of the classified suspension on the stirring foils of the rotor which, in turn, results in that the pressure screen has to be stopped and cleaned, often after a very short period of operation.
  • the device according to the present invention achieves the above object by an improvement which is characterized in that a rotor is used having the form of a cylindrical shell which is closed at least at its bottom portion and about its circumference.
  • the rotor is provided at its circumference with at least one stirring element or stirring rod, acting upon the screen cage.
  • the bottom portion of the rotor comprises means for circulating the suspension to be classified.
  • An enclosed rotor having stirring elements rotating comparatively close to the screen cage is -- surprisingly -- the only possible type of rotor making it possible to avoid the accumulation or conglomeration of solid particles from the suspension on the rotor, without the disadvantage -- which a man skilled in the art would normally fear -- of clogging of the space between the rotor and the screen cage, after a short operation of the device.
  • the rotor were provided with a rotary screen, which is known per se, then it would be impossible to avoid the set of arms by which the rotating screen cage would have to be connected to the rotor shaft; the solid particles of the suspension would accumulate and agglomerate on the arms in the same way as they do on the stirring foils of the known devices of this type.
  • the clearance between the stirring element or stirring elements of the rotor of the present invention and the stationary screen cage is selected so as to secure that the stirring elements have the desired pulsation effect on the openings of the screen cage, i.e. that they create reciprocal flow in the openings of the screen cage generated by reciprocal pressure waves, thus preventing the cloggin of the screen openings.
  • the clearance between the stirring elements and the screen cage cannot be so small as to smear up the openings with solid particles contained in the screened suspension.
  • the enclosed rotor generates the desired forced stock circulation with the device arranged on its bottom, i.e.
  • the maximum size of the particles of the suspension to be classified depends on the pulper which is normally disposed before the device according to the present invention. In other words, it depends on the size of the openings in the outlet screen of the pulper.
  • the spacing between the cylindric case of the rotor which forms the circumference of the rotor, and the screen cage is somewhat greater than the maximum size of the particles of the suspension to be classified.
  • the spacing is preferably 20 to 25 mm.
  • the clearance between the stirring elements and the screen cage can be smaller than the maximum size of the particles, as sufficient intermediate space is provided at the circumference of the rotor between the individual stirring elements. In a preferable embodiment of the device according to the present invention, the clearance between the stirring elements and the screen cage is 10 to 15 mm.
  • a device for generating stock circulation can be obtained at minimum cost by using the bottom of the rotor, which may be provided with at least one, preferably several, and in particular with three ribs which extend in radial direction.
  • these ribs generate acceleration of the suspension flow in radial and tangential direction, thus supporting the desired whirling of the stock. Due to the slight inclination of the stock inlet with respect to the cross-sectional plane of the device, it is of advantage to make the surface of the bottom of the rotor of conical shape.
  • the present invention includes a proposal that the outlet valve for the separated rejects be controlled in dependence on the power consumption of the drive device in such a way that the outlet valve is temporarily opened in an automatic manner upon exceeding a predetermined value of power consumption.
  • the outlet valve is temporarily fully closed and opened upon exceeding the predetermined power consumption figure, or whether the valve is permanently maintained in slightly opened position and is further opened upon exceeding the predetermined magnitude of the power consumption.
  • the drive means is usually formed by an electric motor and it is suitable in such a case to implement the foregoing proposal by including in the power circuit of the motor a current metering device as well as an actuating device for opening the outlet valve, which actuating device is controlled by the said electric current metering means.
  • the concept according to the present invention can be combined with control elements for the outlet valve, wherein the valve is periodically opened or further opened and then again brought into the original condition.
  • a timing circuit is provided for in one preferred embodiment of the invention, for periodical opening and closing of the discharge valve.
  • FIG. 1 is a side view of the apparatus
  • FIG. 2 is a plan view of the apparatus
  • FIG. 3 is axial section of the apparatus along the lines 3 -- 3 of FIG. 2;
  • FIG. 4 is a bottom view of the rotor
  • FIG. 5 is a side view of the rotor
  • FIG. 6 is a section of one of the stirring rods of the rotor, taken along the line 6 -- 6 of FIG. 5.
  • the apparatus shown in FIGS. 1 and 2 consists of a pressure screen and of a vortex cleaner which is disposed below the pressure screen, wherein the pressure screen portion is generally designated by reference number 10 and the vortex cleaner portion by reference numeral 12.
  • the casing of the apparatus consists, in general, of an upper chamber portion 14 and a conical bottom portion 16, which is pivotable about an axis 18, in order to provide for access to the inside of the apparatus.
  • Communicating with the upper chamber portion 14 is an inlet feed pipe 20 which is arranged tangentially and is slightly inclined downwardly.
  • the inlet connection pipe 20 is used in supplying the device with the suspension to be classified.
  • a heavy particle outlet Arranged at the lower end of the conical bottom casing 16 is a heavy particle outlet which is generally referred to with reference numeral 22 and is provided with a slide valve 26, the operation of which is controlled by a pneumatic cylinder 24.
  • the outlet 22 for heavy particles is used in removing the particles separated in the vortex separator 12 of the device.
  • the embodiment shown in the drawings is to be considered as a simplified version of the device; the heavy particle outlet portion preferably contains two slide valves with a collecting chamber disposed therebetween.
  • the upper chamber portion 14 is further provided with an outlet 28, through which the screened suspension can be removed. It is further provided with an outlet 30 for so-called rejects.
  • the outlet 30 is also provided with a slide valve 32.
  • FIG. 1 also shows, in diagrammatic way, the operation and control of the slide valve 32 of the rejected stock outlet.
  • a reciprocally operated pneumatic cylinder is used in actuating the slide valve 32; it is provided with two inlets 46 for pressurized air and is arranged to communicate with a four-way valve 48 which, in turn, is connected to a source of pressure air through a conduit 50. The exhaust air openings of the four-way valve are not shown.
  • the reference numeral 54 shows an actuating magnet 54 which is associated with the four-way valve.
  • the unit 48, 54 is -- in effect -- a magnet operated valve.
  • the electric circuit of the actuating magnet 54 includes a timing circuit 56 and a switch 58 which is controlled by a switching ammeter 60, the above two elements being arranged in the circuit in series; the switching ammeter is incorporated in the circuit of the electric motor 42.
  • the operation of the control of the slide valve 42 of the outlet 30 for rejects will later be explained in association with the operation of the entire apparatus.
  • rings 64 and 66 welded in the upper chamber portion 14 are rings 64 and 66.
  • the ring 64 of these is disposed between the inlet pipe 20 and the accepted stock outlet 28, and a further ring 66 is arranged beneath the rejected stock outlet.
  • the rings support a stationary screen cage 68 in which is disposed a rotor which is generally referred to with reference numeral 70, the rotor being arranged coaxially with the screen cage.
  • the rotor is mounted on the lower end of the rotor shaft 36 which is pivotally mounted in the bearing stand 34.
  • the upper chamber portion 14 is enclosed by a cover 72 which is located above the outlet 30 for rejects, the cover 42 supporting the bearing housing 34.
  • the upper chamber portion 14 is provided with a dilution water inlet 74 communicating into the chamber at the same level as the rejected stock outlet.
  • the inlet for diluting water is also provided with a valve, the valve not being shown in the accompanying drawings.
  • the rotor 70 comprises a cylindric casing 76 which is supported by a disc 78 which, in turn, is fixedly secured to the rotor shaft 36, the bottom portion of the casing 76 being closed by a conical bottom 80.
  • three stock accelerating rods 82 are fixedly secured to the bottom.
  • the inclination of the rods or ribs with respect to the axis of the overall apparatus corresponds to that of the inlet pipe 20.
  • two stirring rods or ribs 86 are fixedly secured to the casing 76, the stirring rods being disposed -- with respect to the axis 84 of the apparatus -- under an angle of inclination in such a manner as to create an upwardly directed lifting effect of the stirring rods upon the classified stock, when the rotor 70 is rotated in the direction of the arrow A of FIG. 5.
  • the stirring rods have a generally wedge-shaped cross section, as will be seen from FIG. 6, of the type wherein the leading edge 86a is higher than the trailing edge 86b, whereby a particularly effective back-flush effect of the stirring rods is generated in the area of openings of the screen cage 68.
  • the spacing between the casing 76 of the rotor 70 and the screen cage 68 is approximately 20 to 25 mm wide, while the clearance between the stirring rods 86 and the screen cage is approximately 10 to 15 mm.
  • the stock accelerating ribs 82 force the incoming suspension to be classified, which has been supplied through the inlet pipe 20 into the apparatus, towards the circumference; the suspension firstly flows downwardly on a helical path inside the vortex cleaner portion 12, wherein the particles having a high specific weight settle and can be removed through the heavy particle outlet 22 out of the chamber. The suspension is further caused to flow into the center of the vortex cleaner upwardly, to enter through the slot between the rotor 70 and the screen cage 68.
  • the switch 58 of the control of the slide valve 32 of the outlet 30 for rejects has to be closed when the power consumption of the electric motor is below the predetermined limiting value. If the timing circuit 56 of the circuitry of the actuating magnet 54 is not interrupted, the slide valve 32 has to stay entirely closed or, at most, slightly opened. The timing circuit 56 is necessary in order to provide periodical opening and closing of the circuit of the actuating magnet 54. Thus, the actuating magnet reverses the four-way valve 48 and the reciprocating pneumatic cylinder 44 opens the slide valve 32 still further or entirely, so that the separated particles of the suspension can be periodically removed through the outlet 30 in batches.
  • the electric motor 42 has to overcome the increased load in the rotor region.
  • the switching ammeter 60 opens the switch 58 thus also causing the slide valve 32 to open and to remain opened until the strong flow thus created in the space between the screen cage 68 and the rotor 70 removes the clogging.
  • the switching ammeter 60 then closes the switch 58 back and the slide valve 32 is thus closed. If necessary, the separated rejected particles of the fiber suspension, which are located above the rotor, can be diluted by dilution water coming from the inlet 74.
  • the arrangement according to the present invention secures an uninterrupted operation of the unit comprising the combination of a vortex cleaner and a pressure screen, by securing an outstanding circulation of the suspension in the vortex cleaner portion, by avoiding the accumulation of solid particles on the rotor and by the inventive control of the valve of the rejects outlet so as to avoid the clogging in the space between the screen cage and the rotor.
  • the above arrangement makes it possible, for the first time, to provide a combination consisting of a vortex cleaner and a pressure screen which can be used in an uninterrupted continuous classification of waste paper stock suspensions having high density.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Centrifugal Separators (AREA)
  • Cyclones (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
US05/554,150 1974-03-20 1975-02-28 Classifying unit for fibrous suspensions Expired - Lifetime US3964996A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DT2413310 1974-03-20
DE19742413310 DE2413310C3 (de) 1974-03-20 Mit einer Rohrschleuder zusammengebauter Drucksichter für Fasersuspensionen

Publications (1)

Publication Number Publication Date
US3964996A true US3964996A (en) 1976-06-22

Family

ID=5910575

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/554,150 Expired - Lifetime US3964996A (en) 1974-03-20 1975-02-28 Classifying unit for fibrous suspensions

Country Status (9)

Country Link
US (1) US3964996A (ru)
JP (1) JPS5228886B2 (ru)
AT (1) AT336392B (ru)
CA (1) CA1011685A (ru)
FI (1) FI59438C (ru)
FR (1) FR2264595B1 (ru)
GB (1) GB1471238A (ru)
IT (1) IT1010022B (ru)
SE (1) SE387142B (ru)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4107033A (en) * 1976-03-20 1978-08-15 Hermann Finckh Maschinenfabrik Apparatus for cleaning fibrous suspensions of low stock consistency
US4167438A (en) * 1977-01-18 1979-09-11 Hermann Finckh Maschinenfabrik Method and apparatus for preparing and cleaning fibrous material
US4200537A (en) * 1977-11-23 1980-04-29 E. Et M. Lamort Apparatus for the purification of paper pulp
US4356085A (en) * 1980-02-21 1982-10-26 J. M. Voith Gmbh Rotary screening machine for pulp suspensions
US4405450A (en) * 1980-10-03 1983-09-20 Escher Wyss Gmbh Method for fractionating fiber stock obtained from waste paper and apparatus for the performance of the aforesaid method
US5072834A (en) * 1990-11-19 1991-12-17 The Black Clawson Company Screening apparatus for paper making stock
US5232552A (en) * 1988-11-17 1993-08-03 Sunds Defibrator Industries Aktiebolag Screening device
US5238117A (en) * 1991-12-20 1993-08-24 Kemix(Proprietary) Limited Mineral processing screen separator
US5323913A (en) * 1992-12-08 1994-06-28 Bird Escher Wyss Inc. Pressure screening apparatus with baffle
ES2064179A2 (es) * 1991-12-23 1995-01-16 Anglo Amer Corp South Africa Metodo y separador para separar particulas adsorbentes de una pulpa y procedimiento de recuperar contenidos metalicos viliosos de una pulpa.
US5542542A (en) * 1994-12-07 1996-08-06 Pulp And Paper Research Institute Of Canada System for detecting contaminants
US5566833A (en) * 1995-01-25 1996-10-22 Hermannfinckh Maschinenfabrik Gmbh & Co. Pressure sorter for fiber suspensions as well as a process for the preparation of fiber suspensions
US5601192A (en) * 1992-06-20 1997-02-11 Hermann Finckh Maschinenfabrik Gmbh & Co. Pressure sorter for fiber suspensions
NL1009609C2 (nl) * 1998-07-10 2000-01-11 Constructie En Systeembouw Ver Inrichting voor het scheiden van vaste deeltjes uit een in hoofdzaak uit vloeistof bestaande substantie.
US6068772A (en) * 1995-12-21 2000-05-30 Hermann Finckh Maschinenfabrik Gmbh & Co. Apparatus for processing fiber suspensions intended for the production of paper or cardboard
US6530481B1 (en) * 1998-02-04 2003-03-11 Valmet Fibertech Aktiebolag Pressure screen with scrap separation
US20040040678A1 (en) * 2000-10-25 2004-03-04 Rolf Ekholm Method and apparatus for washing a fibre suspension
EP1612326A1 (de) * 2004-06-30 2006-01-04 Voith Paper Patent GmbH Drucksortierer zum Sieben einer Faserstoffsuspension
EP1734174A3 (de) * 2005-06-13 2007-11-21 Andritz AG Verfahren zur Wiederverwertung von Füllstoffen und Streichpigmenten der Papier-,Pappe oder Kartonherstellung
WO2009077757A1 (en) * 2007-12-17 2009-06-25 Specialist Process Technologies Limited A separation device
US20130319913A1 (en) * 2012-05-31 2013-12-05 Kaori Ozeki Sieving system, and methods of notifying information, driving and feeding
CN110396849A (zh) * 2019-07-31 2019-11-01 浙江华邦特种纸业有限公司 芳纶纸基材料锥形除砂器

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2526657C3 (de) * 1975-06-14 1978-10-26 Hermann Finckh, Maschinenfabrik, 7417 Pfullingen Drucksichter für Fasersuspensionen
JPS5237657U (ru) * 1975-09-10 1977-03-17
JPS5627491Y2 (ru) * 1975-09-10 1981-06-30
US4166028A (en) * 1976-05-20 1979-08-28 The Black Clawson Company Apparatus for screening paper fiber stock
DE2712749A1 (de) * 1977-03-23 1979-02-08 Finckh Maschf Sortierer zum sichten von fasersuspensionen
JPS58153509A (ja) * 1982-03-08 1983-09-12 Kuri Kagaku Sochi Kk 連続「ろ」過機
SE458036C (sv) * 1987-07-03 1990-09-10 Kamyr Ab Apparat foer uppdelning av en suspension av fiberhaltig cellulosamassa
US5221437A (en) * 1991-07-08 1993-06-22 The Black Clawson Company Screening apparatus for paper making stock
CN111333424A (zh) * 2020-03-12 2020-06-26 浙江吉成新材股份有限公司 一种粉体颗粒表面改性装置
CN113575448A (zh) * 2021-07-19 2021-11-02 江西增鑫科技股份有限公司 一种智能控制饲料除尘设备
DE202022104529U1 (de) 2022-08-09 2023-11-16 Vogelsang Gmbh & Co. Kg Separator zum Separieren eines Mediums

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3255883A (en) * 1963-02-18 1966-06-14 Bird Machine Co Pulp screen with discharge receptacle
US3276583A (en) * 1963-03-05 1966-10-04 Black Clawson Co Paper machinery
US3363759A (en) * 1964-04-29 1968-01-16 Bird Machine Co Screening apparatus with rotary pulsing member
DE1461090A1 (de) * 1964-06-27 1968-12-19 Finckh Metalltuch Maschf Drucksichter
US3458038A (en) * 1966-06-02 1969-07-29 Ingersoll Rand Canada Screening apparatus
US3558484A (en) * 1969-12-11 1971-01-26 Wayne F Carr Separating apparatus
US3612276A (en) * 1969-04-29 1971-10-12 Bird Machine Co Vortex-type separator apparatus
US3859206A (en) * 1972-01-28 1975-01-07 Beloit Corp Stock cleaner and method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3255883A (en) * 1963-02-18 1966-06-14 Bird Machine Co Pulp screen with discharge receptacle
US3276583A (en) * 1963-03-05 1966-10-04 Black Clawson Co Paper machinery
US3363759A (en) * 1964-04-29 1968-01-16 Bird Machine Co Screening apparatus with rotary pulsing member
DE1461090A1 (de) * 1964-06-27 1968-12-19 Finckh Metalltuch Maschf Drucksichter
US3458038A (en) * 1966-06-02 1969-07-29 Ingersoll Rand Canada Screening apparatus
US3612276A (en) * 1969-04-29 1971-10-12 Bird Machine Co Vortex-type separator apparatus
US3558484A (en) * 1969-12-11 1971-01-26 Wayne F Carr Separating apparatus
US3859206A (en) * 1972-01-28 1975-01-07 Beloit Corp Stock cleaner and method

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4107033A (en) * 1976-03-20 1978-08-15 Hermann Finckh Maschinenfabrik Apparatus for cleaning fibrous suspensions of low stock consistency
US4167438A (en) * 1977-01-18 1979-09-11 Hermann Finckh Maschinenfabrik Method and apparatus for preparing and cleaning fibrous material
US4200537A (en) * 1977-11-23 1980-04-29 E. Et M. Lamort Apparatus for the purification of paper pulp
US4356085A (en) * 1980-02-21 1982-10-26 J. M. Voith Gmbh Rotary screening machine for pulp suspensions
US4405450A (en) * 1980-10-03 1983-09-20 Escher Wyss Gmbh Method for fractionating fiber stock obtained from waste paper and apparatus for the performance of the aforesaid method
US5232552A (en) * 1988-11-17 1993-08-03 Sunds Defibrator Industries Aktiebolag Screening device
US5072834A (en) * 1990-11-19 1991-12-17 The Black Clawson Company Screening apparatus for paper making stock
US5238117A (en) * 1991-12-20 1993-08-24 Kemix(Proprietary) Limited Mineral processing screen separator
ES2064179A2 (es) * 1991-12-23 1995-01-16 Anglo Amer Corp South Africa Metodo y separador para separar particulas adsorbentes de una pulpa y procedimiento de recuperar contenidos metalicos viliosos de una pulpa.
US5601192A (en) * 1992-06-20 1997-02-11 Hermann Finckh Maschinenfabrik Gmbh & Co. Pressure sorter for fiber suspensions
US5323913A (en) * 1992-12-08 1994-06-28 Bird Escher Wyss Inc. Pressure screening apparatus with baffle
US5542542A (en) * 1994-12-07 1996-08-06 Pulp And Paper Research Institute Of Canada System for detecting contaminants
US5566833A (en) * 1995-01-25 1996-10-22 Hermannfinckh Maschinenfabrik Gmbh & Co. Pressure sorter for fiber suspensions as well as a process for the preparation of fiber suspensions
US6068772A (en) * 1995-12-21 2000-05-30 Hermann Finckh Maschinenfabrik Gmbh & Co. Apparatus for processing fiber suspensions intended for the production of paper or cardboard
US6530481B1 (en) * 1998-02-04 2003-03-11 Valmet Fibertech Aktiebolag Pressure screen with scrap separation
EP0971067A1 (en) * 1998-07-10 2000-01-12 RainboWW B.V. Device for seperating solid particles out of a suspension existing substantially of liquid
NL1009609C2 (nl) * 1998-07-10 2000-01-11 Constructie En Systeembouw Ver Inrichting voor het scheiden van vaste deeltjes uit een in hoofdzaak uit vloeistof bestaande substantie.
US20040040678A1 (en) * 2000-10-25 2004-03-04 Rolf Ekholm Method and apparatus for washing a fibre suspension
US6946072B2 (en) * 2000-10-25 2005-09-20 Kvaerner Pulping Ab Method and apparatus for washing a fibre suspension
EP1612326A1 (de) * 2004-06-30 2006-01-04 Voith Paper Patent GmbH Drucksortierer zum Sieben einer Faserstoffsuspension
US20060000764A1 (en) * 2004-06-30 2006-01-05 Voith Paper Patent Gmbh Pressurized screen for screening a fibrous suspension
EP1734174A3 (de) * 2005-06-13 2007-11-21 Andritz AG Verfahren zur Wiederverwertung von Füllstoffen und Streichpigmenten der Papier-,Pappe oder Kartonherstellung
WO2009077757A1 (en) * 2007-12-17 2009-06-25 Specialist Process Technologies Limited A separation device
US20110003676A1 (en) * 2007-12-17 2011-01-06 Specialist Process Technologies Limited A separation device
US8794448B2 (en) 2007-12-17 2014-08-05 Specialist Process Technologies Limited Separation device
US20130319913A1 (en) * 2012-05-31 2013-12-05 Kaori Ozeki Sieving system, and methods of notifying information, driving and feeding
CN103447231A (zh) * 2012-05-31 2013-12-18 株式会社理光 筛选系统以及通知信息、控制驱动和控制供给的方法
US9022220B2 (en) * 2012-05-31 2015-05-05 Ricoh Company, Ltd. Sieving system, and methods of notifying information, driving and feeding
CN110396849A (zh) * 2019-07-31 2019-11-01 浙江华邦特种纸业有限公司 芳纶纸基材料锥形除砂器
CN110396849B (zh) * 2019-07-31 2021-05-25 浙江华邦特种纸业有限公司 芳纶纸基材料锥形除砂器

Also Published As

Publication number Publication date
FR2264595A1 (ru) 1975-10-17
CA1011685A (en) 1977-06-07
JPS5228886B2 (ru) 1977-07-29
FI59438C (fi) 1981-08-10
FI750774A (ru) 1975-09-21
SE387142B (sv) 1976-08-30
FR2264595B1 (ru) 1977-10-21
JPS50123905A (ru) 1975-09-29
GB1471238A (en) 1977-04-21
IT1010022B (it) 1977-01-10
DE2413310B2 (de) 1976-12-30
DE2413310A1 (de) 1975-10-02
FI59438B (fi) 1981-04-30
ATA280474A (de) 1976-08-15
AT336392B (de) 1977-05-10

Similar Documents

Publication Publication Date Title
US3964996A (en) Classifying unit for fibrous suspensions
US4107033A (en) Apparatus for cleaning fibrous suspensions of low stock consistency
US3912622A (en) Screening machine with lights removal
US4043919A (en) Pressure screen with turbulence chamber means
US4234417A (en) Fibrous stock screen
WO1995027563A1 (en) Attrition mill
US4634521A (en) Screening apparatus with light reject removal
SE442413B (sv) Centrifugalsil
US4919797A (en) Screening apparatus for paper making stock
CA1318282C (en) Method and apparatus for grading fiber suspension
US4067800A (en) Screening apparatus
US3558484A (en) Separating apparatus
CA2060074C (en) Apparatus for treating fiber suspension
CA1059357A (en) Fiberizer
GB1584574A (en) Method and apparatus for pulping and grading waste material
CA1092549A (en) Vortex separator with coaxial inlet and lightweight reject pipelines
US4216918A (en) Fiberizer
EP0149221B1 (en) Classifier
US4346007A (en) Method at screening apparatus for cleaning the apertures in a screen plate and device for carrying out the method
MXPA01001292A (es) Criba.
NL8302291A (nl) Inrichting en werkwijze voor het zuiveren van oud papier.
US5221437A (en) Screening apparatus for paper making stock
US2791158A (en) Fiber cleaner
US3149067A (en) Screening device
EP0475985B1 (en) Method of and apparatus for separating heavy impurities from fiber suspensions in connection with pumping